Hi,
I'm currently working on a project that consists of taking a line level input from something like an iPod and play it out some speakers. I'm having a problem with the subwoofer and woofer, whenever there are really low notes they must short or something causing the power supply to current limit. I have concluded that it's the woofer/subwoofer because without them connected it works fine.
As for the circuit, I have the line level input coming into 4 sallen-key active filters. For the subwoofer, there is a lowpass filter with a 3db cutoff point @ 200Hz, tweeter has a high pass filter with 3db @ 5KHz, Mid-Range has a band-pass (high pass + low pass in series), and woofer has a band-pass (high pass + low pass in series) with 3dB cutoffs @ 100Hz - 1KHz.
The filters look very good when viewing through an o-scope and scanning through the frequencies. There is no distortion and the 3dB cutoff points are perfect.
From the filters, the signal travels into a TDA7386 chip which is a 4 channel 45 Watt amplifier which then goes out to the 4 respective speakers. I'm not sure if I don't have enough decoupling caps or if I'm doing something wrong with the amplifier chip, but I followed their figure from their datasheet to the t and I'm having the problems.
Any help or suggestions would be GREATLY appreciated.
I'm currently working on a project that consists of taking a line level input from something like an iPod and play it out some speakers. I'm having a problem with the subwoofer and woofer, whenever there are really low notes they must short or something causing the power supply to current limit. I have concluded that it's the woofer/subwoofer because without them connected it works fine.
As for the circuit, I have the line level input coming into 4 sallen-key active filters. For the subwoofer, there is a lowpass filter with a 3db cutoff point @ 200Hz, tweeter has a high pass filter with 3db @ 5KHz, Mid-Range has a band-pass (high pass + low pass in series), and woofer has a band-pass (high pass + low pass in series) with 3dB cutoffs @ 100Hz - 1KHz.
The filters look very good when viewing through an o-scope and scanning through the frequencies. There is no distortion and the 3dB cutoff points are perfect.
From the filters, the signal travels into a TDA7386 chip which is a 4 channel 45 Watt amplifier which then goes out to the 4 respective speakers. I'm not sure if I don't have enough decoupling caps or if I'm doing something wrong with the amplifier chip, but I followed their figure from their datasheet to the t and I'm having the problems.
Any help or suggestions would be GREATLY appreciated.